Enhanced Reachability and Low Latency DENM Dissemination Protocol for Platoon Based VANETs

Abstract

The emerging vehicular ad-hoc networks (VANETs) have paved the way to Cooperative Adaptive Cruise Control (CACC) applications. With such application, cars can travel in platoons with very small headways and thus achieve considerable capacity and fuel consumption gains. In order to ensure safety while exploiting such gains, intra/inter-platoon communications have to rely on a fast and reliable information exchange. Thus, it is important to define relaying schemes which can ensure that reliable platoon applications can be run over the unreliable wireless channel. In this paper, we propose a new dissemination algorithm for the DENMs over platoons, considering the leader as the only vehicle in charge of generating DENMs. Our dissemination algorithm is responsible for electing the vehicles among platoon members for relaying the DENMs. The reliability is met by a proper selection of the best relay based on bidirectional link quality and distance criteria. Unlike existing method for the estimation of the bidirectional link quality (BDSC), which is more suitable for unicast context, we propose an algorithm that accounts for the dissemination context in platoons. A performance comparison with four state-of-theart relaying approaches, based on simulations, shows the high performance of our approach in terms of end to end delay, reachibility, and average number of hops.

Evaluation of Greedy and CBF for ETSI non-area GeoNetworking: The impact of DCC

“…The impairments of area forwarding algorithms, Area CBF and Simple area forwarding, have been analyzed thoroughly [8,9,10,11,12,13,14,15]. These works reveal inefficiencies such as redundant retransmissions due to Decentralized Congestion Control (DCC) queues [15,16], the need for persistent duplicate packet detection [12,14], or poor dissemination coverage [8,9,11,15,17]. These papers have also proposed a number of enhancements to ETSI Area CBF to overcome the shortcomings identified.…”

Improving Emergency Response: An In-Depth Analysis of an ITS-G5 Messaging Strategy for Bus Blockage Emergencies at Level Crossings

“…Within a communication zone of approximately 500 meters, supporting ITS-G5/802.11p communications [10], the RSU broadcasts a DENM to nearby connected road users, effectively announcing the emergency scenario. For our study simulations, we adopt a DENM size of 300 bytes [11].…”